A301638 Primes of the form 5^k + 5*k + 1.

2, 11, 48828181, 298023223876953251, 2910383045673370361328301, 258493941422821148397315216271863391739316284656524658203551

Offset: 1

Author

Seiichi Manyama, Mar 25 2018

Keywords

• nonn

Comments

The next term is too large to include.

The next term has 349 digits. - Harvey P. Dale, Dec 03 2018

Crossrefs

Primes of the form b^k+b*k+1: A163115 (b=2), A180269 (b=3), this sequence (b=5).

Cf. A301635.

Programs

Mathematica

Select[Table[5^n+5n+1,{n,0,550}],PrimeQ] (* Harvey P. Dale, Dec 03 2018 *)

Formula

a(n) = 5^A301635(n) + 5*A301635(n) + 1.